gstreamer/gst-libs/gst/gconf/gconf.c
Julien Moutte f17104b888 Added gst_gconf function to render visualisation plugin from GConf key "default/visualisation"
Original commit message from CVS:
Added gst_gconf function to render visualisation plugin from GConf key "default/visualisation"
Enjoyed that commit to document those functions and remove commented functions
2003-03-29 19:48:38 +00:00

313 lines
7.6 KiB
C

/*
* this library handles interaction with GConf
*/
#include "gconf.h"
#define GST_GCONF_DIR "/system/gstreamer"
static GConfClient *_gst_gconf_client = NULL; /* GConf connection */
/* internal functions */
static GConfClient *
gst_gconf_get_client (void)
{
if (!_gst_gconf_client)
_gst_gconf_client = gconf_client_get_default ();
return _gst_gconf_client;
}
/* go through a bin, finding the one pad that is unconnected in the given
* * direction, and return that pad */
static GstPad *
gst_bin_find_unconnected_pad (GstBin *bin, GstPadDirection direction)
{
GstPad *pad = NULL;
GList *elements = NULL;
const GList *pads = NULL;
GstElement *element = NULL;
elements = (GList *) gst_bin_get_list (bin);
/* traverse all elements looking for unconnected pads */
while (elements && pad == NULL)
{
element = GST_ELEMENT (elements->data);
pads = gst_element_get_pad_list (element);
while (pads)
{
/* check if the direction matches */
if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction)
{
if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL)
{
/* found it ! */
pad = GST_PAD (pads->data);
}
}
if (pad) break; /* found one already */
pads = g_list_next (pads);
}
elements = g_list_next (elements);
}
return pad;
}
/* external functions */
/**
* gst_gconf_get_string:
* @key: a #gchar corresponding to the key you want to get.
*
* Get GConf key @key's string value.
*
* Returns: a #gchar string containing @key's value.
*/
gchar *
gst_gconf_get_string (const gchar *key)
{
GError *error = NULL;
gchar *value = NULL;
gchar *full_key = g_strdup_printf ("%s/%s", GST_GCONF_DIR, key);
value = gconf_client_get_string (gst_gconf_get_client (), full_key, &error);
g_free (full_key);
if (error)
{
g_warning ("gst_gconf_get_string: error: %s\n", error->message);
g_error_free (error);
}
/* FIXME: decide if we want to strdup this value; if we do, check for NULL */
return value;
}
/**
* gst_gconf_set_string:
* @key: a #gchar corresponding to the key you want to set.
* @value: a #gchar containing key value.
*
* Set GConf key @key to string value @value.
*/
void
gst_gconf_set_string (const gchar *key, const gchar *value)
{
GError *error = NULL;
gchar *full_key = g_strdup_printf ("%s/%s", GST_GCONF_DIR, key);
gconf_client_set_string (gst_gconf_get_client (), full_key, value, &error);
if (error)
{
g_warning ("gst_gconf_set_string: error: %s\n", error->message);
g_error_free (error);
}
g_free (full_key);
}
/**
* gst_gconf_render_bin_from_description:
* @description: a #gchar string describing the bin.
*
* Render bin from description @description.
*
* Returns: a #GstElement containing the rendered bin.
*/
GstElement *
gst_gconf_render_bin_from_description (const gchar *description)
{
GstElement *bin = NULL;
GstPad *pad = NULL;
GError *error = NULL;
gchar *desc = NULL;
/* parse the pipeline to a bin */
desc = g_strdup_printf ("bin.( %s )", description);
bin = GST_ELEMENT (gst_parse_launch (desc, &error));
g_free (desc);
if (error)
{
g_print ("DEBUG: gstgconf: error parsing pipeline %s\n%s\n",
description, error->message);
g_error_free (error);
return NULL;
}
/* find pads and ghost them if necessary */
if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SRC))){
gst_element_add_ghost_pad (bin, pad, "src");
}
if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SINK))){
gst_element_add_ghost_pad (bin, pad, "sink");
}
return bin;
}
/**
* gst_gconf_render_bin_from_key:
* @key: a #gchar string corresponding to a GConf key.
*
* Render bin from GConf key @key.
*
* Returns: a #GstElement containing the rendered bin.
*/
GstElement *
gst_gconf_render_bin_from_key (const gchar *key)
{
GstElement *bin = NULL;
gchar *value;
value = gst_gconf_get_string (key);
if (value)
bin = gst_gconf_render_bin_from_description (value);
return bin;
}
/**
* gst_gconf_get_default_audio_sink:
*
* Render audio output bin from GStreamer GConf key : "default/audiosink".
* If key is invalid osssink is used as default output plugin.
*
* Returns: a #GstElement containing the audio output bin, or NULL if
* everything failed.
*/
GstElement *
gst_gconf_get_default_audio_sink (void)
{
GstElement *ret = gst_gconf_render_bin_from_key ("default/audiosink");
if (!ret) {
ret = gst_element_factory_make ("osssink", NULL);
if (!ret)
g_warning ("No GConf default audio sink key and osssink doesn't work");
else
g_warning ("GConf audio sink not found, using osssink");
}
return ret;
}
/**
* gst_gconf_get_default_video_sink:
*
* Render video output bin from GStreamer GConf key : "default/videosink".
* If key is invalid xvideosink is used as default output plugin.
*
* Returns: a #GstElement containing the video output bin, or NULL if
* everything failed.
*/
GstElement *
gst_gconf_get_default_video_sink (void)
{
GstElement *ret = gst_gconf_render_bin_from_key ("default/videosink");
if (!ret) {
ret = gst_element_factory_make ("xvideosink", NULL);
if (!ret)
g_warning ("No GConf default video sink key and xvideosink doesn't work");
else
g_warning ("GConf video sink not found, using xvideosink");
}
return ret;
}
/**
* gst_gconf_get_default_audio_src:
*
* Render audio acquisition bin from GStreamer GConf key : "default/audiosrc".
* If key is invalid osssrc is used as default source.
*
* Returns: a #GstElement containing the audio source bin, or NULL if
* everything failed.
*/
GstElement *
gst_gconf_get_default_audio_src (void)
{
GstElement *ret = gst_gconf_render_bin_from_key ("default/audiosrc");
if (!ret) {
ret = gst_element_factory_make ("osssrc", NULL);
if (!ret)
g_warning ("No GConf default audio src key and osssrc doesn't work");
else
g_warning ("GConf audio src not found, using osssrc");
}
return ret;
}
/**
* gst_gconf_get_default_video_src:
*
* Render video acquisition bin from GStreamer GConf key :
* "default/videosrc". If key is invalid videotestsrc
* is used as default source.
*
* Returns: a #GstElement containing the video source bin, or NULL if
* everything failed.
*/
GstElement *
gst_gconf_get_default_video_src (void)
{
GstElement *ret = gst_gconf_render_bin_from_key ("default/videosrc");
if (!ret) {
ret = gst_element_factory_make ("videotestsrc", NULL);
if (!ret)
g_warning ("No GConf default video src key and videotestrc doesn't work");
else
g_warning ("GConf video src not found, using videotestrc");
}
return ret;
}
/**
* gst_gconf_get_default_visualisation_element:
*
* Render visualisation bin from GStreamer GConf key : "default/visualisation".
* If key is invalid goom is used as default visualisation element.
*
* Returns: a #GstElement containing the visualisation bin, or NULL if
* everything failed.
*/
GstElement *
gst_gconf_get_default_visualisation_element (void)
{
GstElement *ret = gst_gconf_render_bin_from_key ("default/visualisation");
if (!ret) {
ret = gst_element_factory_make ("goom", NULL);
if (!ret)
g_warning ("No GConf default visualisation plugin key and goom doesn't work");
else
g_warning ("GConf visualisation plugin not found, using goom");
}
return ret;
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
gst_plugin_set_longname (plugin,
"Convenience routines for GConf interaction");
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstgconf",
plugin_init
};